A two-dimensional location method based on digital micromirror device used in interactive projection systems

Liangjun Chen; Kai Ni; Qian Zhou; Xuemin Cheng; Jianshe Ma; Yuan Gao; Peng Sun; Yi Li; Minxia Liu

doi:10.1117/12.870655

9 November 2010 A two-dimensional location method based on digital micromirror device used in interactive projection systems

Liangjun Chen, Kai Ni, Qian Zhou, Xuemin Cheng, Jianshe Ma, Yuan Gao, Peng Sun, Yi Li, Minxia Liu

Author Affiliations +

Proceedings Volume 7850, Optoelectronic Imaging and Multimedia Technology; 78500S (2010) https://doi.org/10.1117/12.870655
Event: Photonics Asia 2010, 2010, Beijing, China

Abstract

Interactive projection systems based on CCD/CMOS have been greatly developed in recent years. They can locate and trace the movement of a pen equipped with an infrared LED, and displays the user's handwriting or react to the user's operation in real time. However, a major shortcoming is that the location device and the projector are independent with each other, including both the optical system and the control system. This requires construction of two optical systems, calibration of the differences between the projector view and the camera view, and also synchronization between two control systems, etc. In this paper, we introduced a two-dimensional location method based on digital micro-mirror device (DMD). The DMD is used as the display device and the position detector in turn. By serially flipping the micro-mirrors on the DMD according to a specially designed scheme and monitoring the reflected light energy, the image spot of the infrared LED can be quickly located. By using this method, the same optical system as well as the DMD can be multiplexed for projection and location, which will reduce the complexity and cost of the whole system. Furthermore, this method can also achieve high positioning accuracy and sampling rates. The results of location experiments are given.

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Liangjun Chen, Kai Ni, Qian Zhou, Xuemin Cheng, Jianshe Ma, Yuan Gao, Peng Sun, Yi Li, and Minxia Liu "A two-dimensional location method based on digital micromirror device used in interactive projection systems", Proc. SPIE 7850, Optoelectronic Imaging and Multimedia Technology, 78500S (9 November 2010); https://doi.org/10.1117/12.870655

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KEYWORDS

Digital micromirror devices

Micromirrors

Projection systems

Light emitting diodes

Optoelectronics

Charge-coupled devices

LED displays

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